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Abstract:

In some embodiments fastening apparatus includes a threaded fastening
element adapted to be threaded into a hole provided in a first component,
the threaded fastening element including a locking collar that is defined
by at least one outer peripheral surface, and a locking washer adapted to
fit within a recess formed in the component to limit rotation of the
threaded fastening element once the element is threaded into the
component hole, the washer including an inner opening defined by at least
one inner peripheral surface and a non-circular outer shape defined by an
outer peripheral surface, the inner opening being adapted to receive the
locking collar such that the at least one outer peripheral surface of the
collar can contact the at least one inner peripheral surface of the
washer.

Claims:

1. Fastening apparatus comprising:a threaded fastening element adapted to
be threaded into a hole provided in a first component, the threaded
fastening element including a locking collar that is defined by at least
one outer peripheral surface; anda locking washer adapted to fit within a
recess formed in the component to limit rotation of the threaded
fastening element once the element is threaded into the component hole,
the washer including an inner opening defined by at least one inner
peripheral surface and a non-circular outer shape defined by an outer
peripheral surface, the inner opening being adapted to receive the
locking collar such that the at least one outer peripheral surface of the
collar can contact the at least one inner peripheral surface of the
washer.

3. The apparatus of claim 2, wherein the threaded stud comprises a first
threaded portion that engages threads in the component hole and a second
threaded portion that is exposed when the stud is threaded into the hole
and wherein the locking collar is positioned between the first and second
threaded portions.

4. The apparatus of claim 1, wherein the threaded fastening element
comprises a threaded insert comprising outer threads adapted to engage
threads of the component hole and a threaded hole that is adapted to
receive a threaded bolt.

5. The apparatus of claim 1, wherein the locking collar forms a hexagon
defined by a plurality of planar outer peripheral surfaces.

6. The apparatus of claim 1, wherein the locking washer has a
substantially racetrack outer shape.

8. Fastening apparatus comprising:a threaded stud adapted to be threaded
into a hole provided in a component, the stud including a first threaded
portion adapted to thread into the component hole, a second threaded
portion that is exposed when the stud is threaded into the component
hole, and a locking collar adapted to limit rotation of the stud relative
to the component, the collar being defined by outer peripheral surfaces;
anda locking washer adapted to fit within a recess formed in the
component, the washer including an inner opening defined by inner
peripheral surfaces and a non-circular outer shape defined by an outer
peripheral surface, the inner opening being adapted to receive the
locking collar such that the outer peripheral surfaces of the collar can
contact the inner peripheral surfaces of the washer.

9. The apparatus of claim 8, wherein the locking washer has a
substantially racetrack outer shape.

10. Fastening apparatus comprising:a threaded insert adapted to be
threaded into a hole provided in a component, the insert including a
threaded portion adapted to thread into the component hole, a threaded
opening adapted to receive a threaded bolt, and a locking collar adapted
to limit rotation of the insert relative to the component, the collar
being defined by outer peripheral surfaces; anda locking washer adapted
to fit within a recess formed in the component, the washer including an
inner opening defined by inner peripheral surfaces and a non-circular
outer shape defined by an outer peripheral surface, the inner opening
being adapted to receive the locking collar such that the outer
peripheral surfaces of the collar can contact the inner peripheral
surfaces of the washer.

11. The apparatus of claim 10, wherein the locking washer has a
substantially racetrack outer shape.

12. A threaded stud comprising:a first portion, a second portion, and a
third portion provided along a length of the stud with the second portion
being positioned between the first and third portions, the first and
third portions each comprising threads and the second portion comprising
a locking collar adapted to limit rotation of the stud once it has been
threaded into a component, the collar having a hexagonal shape defined by
a plurality of planar outer peripheral surfaces.

13. A threaded insert comprising:a threaded portion adapted to thread into
a component hole, a threaded opening adapted to receive a threaded bolt,
and a locking collar positioned at an end of the insert and adapted to
limit rotation of the insert relative to the component, the collar having
a hexagonal shape defined by a plurality of outer peripheral surfaces.

Description:

BACKGROUND

[0001]1. Field of the Invention

[0002]The present disclosure generally relates to fastening apparatus.
More particularly, the present disclosure relates to locking fastening
apparatus including locking features that prevent a threaded fastening
element from rotating once the threaded fastening element has been used
to secure components together.

[0003]2. Description of the Related Art

[0004]Threaded fastening elements, such as threaded bolts or studs, are
often used to connect components together. It is important in some
applications to ensure that the threaded fastening element does not
rotate once placed in position within one of the components. In such
applications, locking apparatus is used that, when functioning properly,
does not permit a threaded fastening element to rotate relative to a
threaded hole in which it is received.

[0005]Currently, many fastening apparatuses use keys that are intended to
prevent rotation of a threaded fastening element. In some cases, a
longitudinal slot is formed in a threaded fastening element and in the
threaded hole of a component in which the fastening element is to be
received. When the fastening element is threaded into the threaded hole,
the slot formed in the fastening element is aligned with the slot formed
in the hole and a key is driven into the aligned slots with an
interference fit. Typically, a key comprises a strip of metal with a
square or trapezoidal shaped cross-section. Once the key is driven into
the aligned slots, the fastening element can no longer rotate relative to
the threaded hole.

[0006]The use of such keys can be disadvantageous. For example, if the
fastening element is a threaded stud having exposed threads that become
stripped or otherwise damaged, the stud cannot be easily removed from its
associated component due to the presence of the key. In such a case, it
may be necessary to cut the exposed portion of the stud and drill out the
portion of the stud that is within the component. Such an action can be
expensive to perform and introduces the risk of damage or destruction to
the component threads, which may render the component unusable.

[0007]Furthermore, keys can shear and "liberate" from the threaded opening
in the component. Such liberation may create a hazard when the part is
disassembled by becoming a foreign object with other hardware. Moreover,
keys can fail when the fastening element is over-torqued, thereby
enabling rotation of the fastening element that can result in damage to
the threads of the component into which the fastening element is
threaded, which also may render the component unusable.

SUMMARY

[0008]In one embodiment, the present disclosure relates to fastening
apparatus comprising a threaded fastening element adapted to be threaded
into a hole provided in a first component, the threaded fastening element
including a locking collar that is defined by at least one outer
peripheral surface, and a locking washer adapted to fit within a recess
formed in the component to limit rotation of the threaded fastening
element once the element is threaded into the component hole, the washer
including an inner opening defined by at least one inner peripheral
surface and a non-circular outer shape defined by an outer peripheral
surface, the inner opening being adapted to receive the locking collar
such that the at least one outer peripheral surface of the collar can
contact the at least one inner peripheral surface of the washer.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]The disclosed fastening apparatus can be better understood with
reference to the following drawings. The components in the drawings are
not necessarily to scale.

[0010]FIG. 1 is an exploded side view of a first embodiment of fastening
apparatus and components that the fastening elements can fasten together.

[0011]FIG. 2 is a cross-sectional side view of the fastening apparatus and
components of FIG. 1, with the fastening elements shown fastening the
components together.

[0012]FIG. 3 is an exploded side view of a second embodiment of fastening
apparatus and components that the fastening elements can fasten together.

[0013]FIG. 4 is a cross-sectional side view of the fastening apparatus and
components of FIG. 3, with the fastening elements shown fastening the
components together.

DETAILED DESCRIPTION

[0014]Described in the following are fastening apparatuses that can be
used to fasten components together, such as a flange and a housing. The
fastening apparatuses include locking features that prevent a threaded
fastening element from rotating once the threaded fastening element has
been used to secure the components together. However, unlike fastening
apparatuses of the prior art, the threaded fastening element can be
easily removed from the threaded hole when necessary without damaging the
component in which the fastening element is received.

[0015]In the following, various embodiments of fastening elements are
disclosed. Although specific embodiments are presented, those embodiments
are mere example implementations of the disclosed fastening elements and
it is noted that other embodiments are possible. All such embodiments are
intended to fall within the scope of this disclosure.

[0016]Turning to the figures, in which like numerals identify
corresponding components, FIG. 1 illustrates a first embodiment of
fastening elements 10 that can be used to fasten components together. In
the embodiment of FIG. 1, the exemplary components to be fastened
together comprise a flange 12 that is to be fastened to a housing 14. The
fastening elements 10 include a threaded stud 16 that can be received by
a threaded hole 18 formed in the housing 14, and a locking washer 20 that
is used to prevent rotation of the stud once placed in a desired position
within the hole. In addition, the fastening elements 10 include a
threaded nut 22, such as a locking nut.

[0017]In the embodiment of FIG. 1, the threaded stud 16 comprises a first
or bottom portion 24, a second or middle portion 26 (or "shank"), and a
third or top portion 28 provided along the length of the stud. By way of
example, the first, second, and third portions 24-28 are unitarily formed
from a single piece of material, such as steel. Both the first and third
portions 24, 28 comprise threads 30 and 32 that enable fastening.
Specifically, the threads 30 of the first portion 24 are adapted to mesh
with threads of the threaded hole 18 of the housing 14 and the threads 32
of the third portion 28 are adapted to mesh with threads of the threaded
nut 22. In the embodiment of FIG. 1, the threads 30 of the first portion
24 are relatively coarse and the threads 32 of the third portion 28 are
relatively fine; however, other thread counts and thread orientations are
contemplated.

[0018]Unlike the first and third portions 24, 28, the second portion 26 of
the threaded stud 16 comprises no threads. However, the second portion 26
comprises a locking collar 34 that, as described below, can mate with
surfaces of the locking washer 20. In some embodiments, the collar 34 is
a hexagonal collar that comprises a plurality of planar outer peripheral
surfaces 36.

[0019]The locking washer 20 is formed from a relatively thin piece of
material, such as steel, and comprises an inner opening 38 that is
defined by one or more planar inner peripheral surfaces 40. The opening
38 is adapted to receive the locking collar 34 of the threaded stud 16
with relatively close tolerance and, therefore, the inner peripheral
surfaces 40 are adapted to contact the outer peripheral surfaces 36 of
the collar. The locking washer 20 has a non-circular outer shape that is
defined by a non-circular outer peripheral surface 42. In the embodiment
of FIG. 1, the outer peripheral surface 42 forms a substantially oval
shape. More particularly, the outer peripheral surface 42 forms a
"racetrack" shape which is rectangular slot with full rounded ends such
that the locking washer 20 comprises a relatively long axis and a
relatively short axis (when viewed from above or below).

[0020]As is further illustrated in FIG. 1, the housing 14 comprises a
locking recess 44 that is formed around or adjacent the threaded opening
18. The recess 44 is adapted to receive the locking washer 20 in its
entirety such that, when the washer is disposed within the recess,
substantially no portion of the washer extends beyond an outer surface 46
of the housing 14. Therefore, the recess 44 has a depth that is at least
as large as the thickness of the washer 20.

[0021]The recess 44 is defined by a planar base 47 and an inner peripheral
surface 48 that defines its shape. The recess 44 is adapted to receive
the locking washer 20 with relatively close tolerance and, therefore, the
recess has a shape that is similar to the shape of the washer and the
inner peripheral surface 48 is adapted to contact the outer peripheral
surface 42 of the washer to provide positive engagement. In embodiments
in which the washer 20 has a substantially oval or racetrack shape, the
recess 44 can also have a substantially oval or racetrack shape.

[0022]As is also shown in FIG. 2, the flange 12 includes an opening 50
that is adapted to receive the threaded stud 16 and, more particularly,
the second and third portions 26, 28 of the stud. In addition, the
threaded nut 22 includes an opening 52 that is adapted to receive the
stud 16 and, more particularly, the third portion 28 of the stud.

[0023]FIG. 2 illustrates the fastening elements 10 in use in securing the
flange 12 to the housing 14. As indicated in FIG. 2, the threaded stud 16
is threaded into the threaded hole 18 of the housing 14 such that the
threads of the first portion 24 of the stud mesh with the threads of the
hole. When the stud 16 is substantially fully threaded into the hole 18,
the locking collar 34 is positioned within the housing recess 44. The
locking washer 20 is also positioned within the housing recess 44 with
the collar 34 of the stud 16 received within the opening 38 of the
washer. To enable the collar 34 to be so received, the stud 16 may need
to be rotated within the hole 18 such that the outer peripheral surfaces
36 of the collar align with the inner peripheral surfaces 40 of the
collar. In some embodiments, this can be achieved by fully threading the
stud 16 into the hole 18 and then backing the stud out of the hole a
fraction of a full turn such that the washer 20 can be accommodated.

[0024]Once the locking washer 20 has been positioned within the locking
recess 44 around the locking collar 34, the threaded stud 16 will not be
able to rotate relative to the threaded hole 18. Specifically, contact
between the outer peripheral surface 42 of the washer 20 and the inner
peripheral surface 48 of the recess 44 prevents the washer from rotating
relative to the housing 14, and engagement between the outer peripheral
surfaces 36 of the collar 34 and the inner peripheral surfaces 40 of the
washer prevents the stud 16 from rotating relative to the washer (see
FIG. 1).

[0025]The flange 12 is placed in contact with the housing 14 with the
flange opening 50 receiving the threaded stud 16. In such an orientation,
part of the third portion 28 of the stud 16 will extend beyond the outer
surface of the flange 12 and therefore can receive the threaded nut 22.
Once the nut 22 has been threaded onto the stud 16 and placed in firm
contact with the flange 12, the flange will be secured to the housing 14.
Notably, the presence of the flange 12 prevents the locking washer 20
from leaving the housing recess 44.

[0026]FIG. 3 illustrates a second embodiment of fastening elements 100
that can be used to fasten components together. Like the embodiment of
FIG. 1, the exemplary components to be fastened together in FIG. 3
comprise a flange 102 that is to be fastened to a housing 104. The
fastening elements 100 include a threaded insert 106 that can be received
by a threaded hole 108 formed in the housing 104, and a locking washer
110 that is used to prevent rotation of the insert once placed in a
desired position within the hole. In addition, the fastening elements 100
include a threaded bolt 112.

[0027]In the embodiment of FIG. 3, the threaded insert 16 is unitarily
formed from a single piece of mater, such as steel, and comprises a
threaded portion 114 and a locking collar 116. The threaded portion 114
comprises threads 118 that are adapted to mesh with threads of the
threaded hole 108 of the housing. The locking collar 116 is positioned at
an end of the insert 106 and comprises a plurality of planar outer
peripheral surfaces 120 that, as described below, can mate with surfaces
of the locking washer 110. In addition, the insert 106 comprises a
threaded hole 122 that includes threads 124 that are adapted to mesh with
threads of the threaded bolt 112.

[0028]Like the locking washer 20 of FIG. 1, the locking washer 110 is
formed from a relatively thin piece of material, such as steel, and
comprises an inner opening 126 that is defined by one or more planar
inner peripheral surfaces 128. The opening 126 is adapted to receive the
locking collar 116 of the threaded insert 106 with relatively close
tolerance and, therefore, the inner peripheral surfaces 128 are adapted
to engage the outer peripheral surfaces 120 of the collar. The locking
washer 110 has a non-circular outer shape that is defined by a
non-circular outer peripheral surface 130. In the embodiment of FIG. 3,
the outer peripheral surface 130 forms a substantially oval or racetrack
shape such that the locking washer 110 comprises a relatively long axis
and a relatively short axis (when viewed from above or below).

[0029]As is further illustrated in FIG. 3, the housing 104 comprises a
locking recess 132 that is formed around or adjacent the threaded opening
108. The recess 132 is adapted to receive the locking washer 110 in it
entirety such that, when the washer is disposed within the recess,
substantially no portion of the washer extends beyond an outer surface
134 of the housing 104. Therefore, the recess 132 has a depth that is at
least as large as the thickness of the washer 110.

[0030]The recess 132 is defined by a planar base 136 and an inner
peripheral surface 138 that defines its shape. The recess 132 is adapted
to receive the locking washer 110 with relatively close tolerance and,
therefore, the recess has a shape that is similar to the shape of the
washer and the inner peripheral surface 138 is adapted to contact the
outer peripheral surface 130 of the washer to provide positive
engagement. In embodiments in which the washer 110 has a substantially
oval or racetrack shape, the recess 132 can also have a substantially or
racetrack oval shape.

[0031]As is also shown in FIG. 3, the flange 102 includes an opening 140
that is adapted to receive the threaded bolt 112. The bolt 112 includes a
threaded portion 142 that comprises threads 144 that mesh with the
threads 124 of the threaded insert 106.

[0032]FIG. 4 illustrates the fastening elements 100 in use in securing the
flange 102 to the housing 104. As indicated in FIG. 4, the threaded
insert 106 is threaded into the threaded hole 108 of the housing 104 such
that the threads 118 mesh with the threads of the hole. When the insert
106 is substantially fully threaded into the hole 108, the locking collar
116 is positioned within the housing recess 132. The locking washer 110
is also positioned within the housing recess 132 with the collar 116 of
the insert 106 received within the opening 126 of the washer. To enable
the collar 116 to be so received, the insert 106 may need to be rotated
within the hole 108 such that the outer peripheral surfaces 120 of the
collar align with the inner peripheral surfaces 128 of the collar. In
some embodiments, this can be achieved by fully threading the insert 106
into the hole 108 and then backing the insert out of the hole a fraction
of a full turn such that the washer 110 can be accommodated.

[0033]Once the locking washer 110 has been positioned within the locking
recess 132 around the locking collar 116, the threaded insert 106 will
not be able to rotate relative to the threaded hole 108. Specifically,
contact between the outer peripheral surface 130 of the washer 110 and
the inner peripheral surface 138 of the recess 132 prevents the washer
from rotating relative to the housing 104, and contact between the outer
peripheral surfaces 120 of the collar 116 and the inner peripheral
surfaces 128 of the washer prevents the insert 106 from rotating relative
to the washer (see FIG. 3).

[0034]The flange 102 is placed in contact with the housing 104 with the
flange opening 140 receiving the threaded bolt 112. Once the bolt 112 has
been threaded onto the insert 106 and placed in firm contact with the
flange 102, the flange will be secured to the housing 104. Notably, the
presence of the flange 102 prevents the locking washer 110 from leaving
the housing recess 132.

[0035]With the embodiments disclosed above, a threaded fastening element,
such as a threaded stud or a threaded insert, can be removed when desired
without damaging a component to which the fastening element is attached,
such as an expensive housing. Specifically, the nut or bolt used to
fasten components together can be removed and the locking washer simply
withdrawn from its recess to enable the threaded fastening element to be
removed and replaced, if necessary.

[0036]In the foregoing, locking washers have been described as being held
in place within a recess by being trapped between fastened components.
Notably, however, further retaining means can be used to retain the
locking washer within its recess, if desired. In some embodiments, the
locking washer can be glued or welded in place. In other embodiments, the
locking washer can be staked in place, for example by deforming the edges
of the recess so as to fix the washer in place. In still other
embodiments, the locking washer can be placed within the recess with an
interference fit.